HEPA is an acronym for “High Efficiency Particulate Arrestance.” This acronym refers to a filter that is manufactured and tested, to current HEPA filter standards. The standards require a HEPA filter to capture a minimum of 99.97% of the 0.3-micron (0.000012-inch) particles in the air passing through the filter.
What is it that makes HEPA filters so efficient?
The ultra-fine, glass-fiber medium captures microscopic particles that can easily pass through other filters. The captured Particle size is about 300 times smaller than the diameter of a human hair. This action is the equivalent of stopping a cotton ball with a door screen.
Are HEPA filters suitable for infectious patient isolation?
Yes. Current CDC Guidelines for Environmental Infection Control in Healthcare Facilities recommend HEPA filtration for the capture of pathogens, microbial spores and other contaminants in the air exhausted from patient isolation rooms.
Are 99.97% HEPA filters suitable for Tobacco Smoke environments?
No. The filter in the Model F111 is rated at 95% Ashrae standards. These 95%
(.3-micron) filters are more than 95% efficient in the removal of contaminants.
A 99.97% efficiency filter would clog and cause a substantial loss of air volume
in a Tobacco Smoke environment.
Does filter efficiency decrease as the filter gets dirty?
No, quite the contrary. Unlike electrostatically-charged air filters and other technologies that experience substantial loss of efficiency as they become dirty, exactly the opposite typically happens with HEPA or media filters. The dirtier a filter gets, the more efficient it can become.
When is it time to change the F111 Filter in a Tobacco Smoke Environment?
Generally, 6-8 months depending on the volume of smoke and the square footage of the smoking lounge. If the face of the filter is dark brown, inspect the back side. If the back side is also dark brown it is time to change the filter.
Please call us when determining how many air cleaners are required for your space.